Crane for lifting, lowering, and transporting loads



Aug. 3,1926. 1,595,029

R. A. SMITH ET AL cngma FOR LIFTING, LOWERING, AND TRANSPORTING LOADSFiled Oct. 15, 1925 Fjgfi. o

ssa esae ys,iezs. p I p UNITED-STATES PATENT OFFICE.

stars; or LONDON, m moms mcoox, or SOUTKEND-ON-SEA,

nnomn.

CRANE FOB LIFIING, LO'WEBING, AND TRANSPOBI'DTG LOADS.

a lication filed oczbm 15, 1923, Serial. No.

l vWith this type of travelling crane, a load carried by the jib' has atendency to tilt "of the ib occupies a fixed 7 substantiallyJ thecarriage, and in the constructions here-- rovided, since the pivotalsupport osition, the tilting moment applied to th s carriageprogressively increases as the jib is owered about its pivotal support,that is to say, as it approaches a horizontal position. v

tofore This'invention provides an improved 0011-.

struction. of automobile crane in which the radius at which the tiltingforce acts is kept constant for all o'sitions of 'n a wide angle 0movement.

the jib wit The improved crane is thus especially adapted for use incases where it is required to lower the jib whilst a load is suspendedthereon, for example, in order that the crane may be able to passthrough a doorway or beneath an arch before depositing its load. Inorder to obtain this result, the pivotal support of the jib is carriedby'a frame mov-' able alon a guideway or track on the car riage, an aguide pin or roller carried by the jib, or an extension thereof, isarranged to travel on a cam path, the paths of the pivot frame and theroller being correlated 111 such a manner that, when the jib is raisedto its highest position the frame is near one end or side of thecarriage, and in order to lower the jib towards a horizontal positionthe frame must be moved'rearwardly or towards the opposite side or endof the carriage. The said in or roller may be arranged between the sadof the jib and its pivotal support, or it may be arranged on anextension of the jib projecting forwardly or rearwardly at any desiredangle, the cam path for this pin or roller being appropriately situatedabove or below the guideway or track for the pivot frame. The framecarrying the pivotal support of the jib, and, in some cases, the pin orroller also, may be moved along their respective paths by a nut andscrew rack and pinion or like mechanism driven through worm andworm-wheel, bevel or like'gearing. 1 v 4 In the accompanying drawingwhich 868,720, and in Great Britain October 31, 1822.

shows how the said invention may be conveanently and advantageouslycarried into practice: v

Figure 1 is a side view, and Flgure 2 a plan of an automobile craneconstructed In accordance with this invent1on and Figure 3 is a detailview of partsof the lmproved crane. l As shown in this drawing, 1 is anunder carnage carried on road wheels 2 driven through a shaft 3 andsteered bya rod 4. t

A carriage 5 1fiounted on a turntable support 6 on the undercarria e 1carries a suitable motor 7 geared to t e shaft 3 and to' gearmgS bywhich the carriage 5 may be,

rotated on the undercarriage 1. i

' A ]1b .9 1s plvotally mounted on a shaft 10 carrying pimons 11 whichare arranged to travel alon inclined racks 12; Extensions 13 of the i9'carry rollers 14 which travel along cam paths 15 inclined to the racks12. From a consideration of Figure 1 it will be ap arent that, when theshaft 10 is at the rlght and end of the racks 12, the jib will besupported in the raised position, shown in full lines, by the extensions13 and rollers 14 bearing against the cam paths 15, and,

when the shaft 10 is at theleft hand end of the racks 12, the jib .willbe lowered to the position indicated in broken lines. Whilst the j1b ismovin between these two positrons the jib heat? stantially vertical lineso that the tiltin movement exerted on the carriage by a loa carried onthe jib will remain practically constant since the radius at which itacts is not substantially changed. 1

The shaft 10 is mounted in frame part 16 slidable along shafts 17 drivenb the motor 7 through the shafts 18" an reversing *clutcheslQ. Worms 2O'vely rotating with the shafts 17 and sli able thereon are held withinthe said frame parts, 16. One

9 will move along a sub-.' Q

'of these worms is in. gear with a. worm are? a carried on the saidmovable frame, driving shafts on which the movable frameis slidablymounted, and gearing transmitting motion from the said shafts to themovable said frame, drivin frame and winding drum, respectively.

2. A crane comprising a jib, a frame on which the jib is pivotallysupported, an extension of the jib carrying a roller, a guide track forthe roller arranged divergently with respect to the path of the saidframe, a windin drum carried on the said frame, driving s afts on whichthe movable frame is slidably mounted, and gearing transmitting motionfrom the said shafts to the movable frame and winding drum,respectively.

3. A crane comprising a carriage, a jib, a frame on which the jib' ispivotall supported, a roller on the said jib space apart from the saidpivotal support of the jib, a guide track for the said roller, a motoron the'carriage, a winding drumcarried on the shafts cared to the saidmotor and having the said frame slidably mounted thereon, and gearingtransmitting motion from the said shafts to the frame and winding drum,respectively.

4. A crane comprisin a carriage, a jib, a frame on which the jib ispivotally supported, a roller on the said jib, and a ide track for thesaid roller, arranged iver gently with respect to the track along whichthe frame is movable, a motor on the carriage, a winding drum carried onthe said frame, driving shafts geared to the said motor and having thesaid frame slidably mounted thereon, and gearing transmitting motionfrom the said shafts to the frame and winding drum, respectively.

5. A'crane comprising a carriage, an under carriage, a turntable supporton the undercarriage on which the carriage is mounted, a jib, a frame onwhich the ib is pivotally mounted, a roller on the ji spaced apart fromthe pivotal support of the said jib, divergent tracks on the carriagealong which the frame and roller are respectively mov-- able, a motor onthe carriage, a winding drum carried on the said frame, driving shaftsgeared to the said motor and having the said frame slidably mountedthereon, and gearing transmitting motion from the said shafts to theframe and winding drum, respectively. i v j 6. A crane comprising acarriage, a jib, a shaft on which the jib is pivotally mounted, rackscarried by the said carriage, pinions on the said shaft in mesh with thesaid racks, means for rotating the shaft,a roller on the jib spacedapart from the pivotal sup port of the jib, a track for the said rollerarranged divergently with respect to the said racks, a motor on thecarriage, a winding drum rotatably mounted'on the jib shaft, I drivingshafts geared to the said motor and having the said frame slidablymounted thereon, and gearing transmitting motion to the racks and havingthe said frame slidably mounted thereon, gearing connecting the saidshafts, a winding drum rotatably mounted on the jib shaft, a seconddriving shaft arranged parallel to the racks and having the frameslidably mounted thereon, gearing connecting said second driving shaftto the winding drum, a roller on the jib spaced apart from the pivotalsupport of the jib, and a track for the said roller arranged divergentlywith respectto the said racks. v

8. A crane comprising a carriage, a jib, a shaft on which the jib ispivotally mounted, racks carried'by the said carriage, pinions on thesaid shaft in mesh with thesaid racks, a frame in which the said shaftis mounted to rotate, a driving shaft arranged parallel to the saidracks and having the frame slidably mounted thereon, a worm carried bythe frame and mounted on the said driving shaft to rotate therewith andslidable thereon, a worm wheel fast on the jib-supporting shaft and ingear with the said worm, a winding drum rotatably mounted on thejib-supporting shaft, a second driving shaft arranged parallel to thesaid racks and having: the frame slidably mounted thereon, a second wormcarried by the frame a roller on the jib spaced apart from the pivotalsupport of the jib, and a track for the said roller arranged divergentlywith respect to the said racks.

9. A crane comprising a carriage, racks carried by the said carriage, ajib, a shaft on which the jib is pivotally mounted, a frame carrying thesaid shaft, pinions on-the said shaft in mesh with the racks carried bythe carriage, a driving shaft arranged parallel to the said racks andhaving the frame slidable thereon, a worm carried by the frame andmounted on the said driving shaft to rotate'therewith and slidablethereon, a worm wheel fast on the said jib supporting shaft and in gearwith the said worm, a roller on the jib spaced apart from the pivotalsupport of the jib, and a track for the said roller arranged divergentlywith respect to the said racks.

10. A crane comprising a carriage, a jib, a winding drum, a shaft onwhich the jib no i and drum are mounted, a motor on the carriage, atrack along which the shaft is movable, a gearing connection between themotor and the shaft to move the said shaft along its track, and agearing connection between the motor and the winding drum.

11. A crane comprising a carriage, a jib, a winding drum, a shaftsupporting the jib and the drum, a. motor on the carriage, pinions onthe shaft, racks on which said pinions travel when the shaft is rotated,a gearing connection between the motor and the shaft to rotate thelatter, and a second caring connection between the motor an drum torotate the latter independently of the movement of the shaft when thepinions travel along the racks.

the r 12 A crane comprising a carriage, a jib,

a winding drum, a shaft supporting the 11b and drum, a frame in whichthe shaft 1s mounted to rotate, pin'ions on the shaft, racks on whichsaid pinions travel when the shaft is rotated, driving shafts on whichthe frame is slidably mounted, a worm carried by the frame and rotatedby one of the driving shafts, a worm wheel fast on the jibrsupportingshaft and in gear with th said worm, a second worm carried by the frameand rotated by another of the driving shafts, and a worm wheel carriedby the windmg drum and in ear with the said second worm.

ROBERT ARTHUR SMITH.

THOMAS MEACOCK.

